You don't need a fancy programme to do it; just MS Paint. Open up two MS Paints; then go looking in google for a photo that suits your needs. Paste it into one Paint, and trim it as you want. Then open up your doll in your second Paint. In both Paints, click the second box underneath the main menu, the one with the transparent boxes. That will make sure that your doll transfers. Then copy the doll and paste on to the background. If there's any white bits, you'll have to fill them in again.